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Recursive calls to a function - why is the address of the parameter passed to it lowering with each call?

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6

Consider following code:

#include <iostream>
using namespace std;
void test_func(int address) 
 cout<<&address<<" ";
 if(address < 0x7FFBEE26) 
 test_func(address);
 

int main()

 test_func(512);
 cout<<"Hello";
 return 0;

Hello from main() is certainly not reached, since the recursive calls to test_func never end.

However, from what I can see in the cout present in test_func - the addresses being printed are lower and lower with each iteration. Why is that happening?

c++

share|improve this question

edited 59 mins ago

drescherjm

6,58923553

asked 1 hour ago

tears allotears allo

311

New contributor

tears allo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You are passing a copy - that has to have an address
  
  – UnholySheep
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Remember that the default stack size on linux is 10MB and its 1 MB on windows. Also the stack need not be in the same location each time you run your program.
  
  – drescherjm
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I can't understand why this isn't eligible for tail-call optimization. The invocation of test_func is the last line in the function...
  
  – cyberbisson
  35 mins ago
  
  

  
  
  
  

add a comment | 

6

Consider following code:

#include <iostream>
using namespace std;
void test_func(int address) 
 cout<<&address<<" ";
 if(address < 0x7FFBEE26) 
 test_func(address);
 

int main()

 test_func(512);
 cout<<"Hello";
 return 0;

Hello from main() is certainly not reached, since the recursive calls to test_func never end.

However, from what I can see in the cout present in test_func - the addresses being printed are lower and lower with each iteration. Why is that happening?

c++

share|improve this question

edited 59 mins ago

drescherjm

6,58923553

asked 1 hour ago

tears allotears allo

311

New contributor

tears allo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You are passing a copy - that has to have an address
  
  – UnholySheep
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Remember that the default stack size on linux is 10MB and its 1 MB on windows. Also the stack need not be in the same location each time you run your program.
  
  – drescherjm
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I can't understand why this isn't eligible for tail-call optimization. The invocation of test_func is the last line in the function...
  
  – cyberbisson
  35 mins ago
  
  

  
  
  
  

add a comment | 

Consider following code:

#include <iostream>
using namespace std;
void test_func(int address) 
 cout<<&address<<" ";
 if(address < 0x7FFBEE26) 
 test_func(address);
 

int main()

 test_func(512);
 cout<<"Hello";
 return 0;

Hello from main() is certainly not reached, since the recursive calls to test_func never end.

However, from what I can see in the cout present in test_func - the addresses being printed are lower and lower with each iteration. Why is that happening?

c++

share|improve this question

edited 59 mins ago

drescherjm

6,58923553

asked 1 hour ago

tears allotears allo

311

New contributor

tears allo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

#include <iostream>
using namespace std;
void test_func(int address) 
 cout<<&address<<" ";
 if(address < 0x7FFBEE26) 
 test_func(address);
 

int main()

 test_func(512);
 cout<<"Hello";
 return 0;

share|improve this question

edited 59 mins ago

drescherjm

6,58923553

asked 1 hour ago

tears allotears allo

311

New contributor

tears allo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 59 mins ago

drescherjm

6,58923553

asked 1 hour ago

tears allotears allo

311

New contributor

tears allo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 59 mins ago

drescherjm

6,58923553

edited 59 mins ago

drescherjm

6,58923553

asked 1 hour ago

tears allotears allo

311

New contributor

tears allo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 1 hour ago

tears allotears allo

311

1 Answer
1

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10

Likely address is being placed on the stack and, on your platform, the stack grows downward in memory. See this question about stack growth direction for more.

share|improve this answer

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232

add a comment | 

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10

Likely address is being placed on the stack and, on your platform, the stack grows downward in memory. See this question about stack growth direction for more.

share|improve this answer

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232

add a comment | 

10

Likely address is being placed on the stack and, on your platform, the stack grows downward in memory. See this question about stack growth direction for more.

share|improve this answer

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232

add a comment | 

Likely address is being placed on the stack and, on your platform, the stack grows downward in memory. See this question about stack growth direction for more.

share|improve this answer

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232

share|improve this answer

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232

answered 1 hour ago

David SchwartzDavid Schwartz

140k14145232